ASME_Shell_Manhole_Ring_Thickness - Boiler Engineering Calculations

ASME - Shell Manhole Ring Thickness

Shell Manhole Ring Thickness

MKS: Diameter/Thickness- mm, Pressure/Stress- kg/cm2

SI: Diameter/Thickness- mm, Pressure/Stress- Mpa

FPS: Diameter/Thickness- in, Pressure/Stress- psi

Major OD, a:

Minor OD b:

Shell Design Pressure, P:

kg/cm2

Stress Valus, S:

kg/cm2

Min Thk of Manhole Ring, t:

ASME - Shell Manhole Ring Thickness

** This Thickness is also greater then 11/16'' i.e (0.6875" = 17 mm) Which is minimum bearing surface for gasket. Hence thickness provided is adequate.
D=a^2/b - Ref PG-28
Y : a coefficient having values refer table PG-27.4 NOTE-6 ( Page. No. 15 ) For nonferrous materials not listed = 0.4 ,
"Allowance C : Allowance for Structural Stability, Threading Etc =0
Allowance for threading and minimum structural stability is not intended to provide for conditions of misapplied external loads or for mechanical abuse."
Ligament efficiency E : Least of Longitudinal Ligament Efficiency , Circumferential Ligament Efficiency. & Equivalent Longitudinal Ligament Efficiency Of Diagonal Ligament (As per : PG-52.2 ,52.4 )
Corrosion Allowance =3.2 for drum & dishend